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Intangible Assets, Net - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Finite Lived Intangible Assets Accumulated Amortization Addition $ 4,211,621 $ 4,322,476 $ 8,606,522 $ 8,697,317
Exclusivity [Member]        
Finite Lived Intangible Assets Accumulated Amortization Addition $ 106,000   $ 212,000